I don't know, probably not. But then again, once I do a few high speed runs just to see how fast it can really go, I'll probably drop the gearing to something more reasonable and play. If I do that, I might use a gyro to help compensate for my less-than-stellar driving skills.
I stopped by the LHS to show off my project. Let's just say I got a lot of positive feedback! No one recognized the GTP because of all the custom stuff, and once they knew, they couldn't believe it was all done with basic tools (Jigsaw, Dremel, files, hammer, vice). A couple even took pics with their camera phones to show the only other electric-head there; Dustin (glassdoctor), but I told them he's probably already seen this thread.
While there, I picked up a set of Revo springs for the front since the stock springs were not close to stiff enough to keep the front from dragging at high speed (lots of downforce) and weight. We started with the purple set (highest rate) and it was a REAL PITA to get on there! It took two of us, and neither are small guys! Well, all that work and purple was too stiff. I went down to the golds and it was perfect - still a PITA to get on there, but not near as bad. To match the front, I had to dial in max preload in the rears. Seemed just right. I'd like to get a stiffer set in the back so I don't need quite so much preload, but don't know what will work.